There is no standard answer for this year's exam.
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Multiple-choice questions: (Each question is 1 point, total 20 points)
When using a megohmmeter to measure the insulation resistance, a single wire should be used to connect the lines L and The ground E terminal is connected to the object under test. The connecting wire of the ( ) terminal must be well insulated from the earth. ( )
A: L; B: E, C: G
should be used when working on the secondary wiring circuit without powering off the high-voltage equipment ( )
A Switching operation ticket B The first type of work ticket C The second type of work ticket
After using up the multimeter, the selection switch should be set to the ( ) position.
A resistance; B voltage; C AC voltage; D current.
The key to forward and reverse control of three-phase asynchronous motors is to change ().
(A) Power supply voltage (B) Power supply phase sequence (C) Power supply current (D) Load size
The oil of the power transformer plays the role of ( ).
A. Insulation and arc extinguishing B. Insulation and rust prevention C. Insulation and heat dissipation
The function of the series resistor in the traffic light circuit of the high-voltage switch cabinet is: ()
Prevent the short circuit of the lamp holder from causing the circuit breaker to malfunction B. Prevent the bulb from burning out
C. Prevent the closing coil from burning out D. Reduce the operating current
The lightning protection grounding resistance of electrical equipment must not be less than ( ) ohms.
A, 1 ohm B, 4 ohm C, 6 ohm D, 10 ohm
The unit of the impedance voltage on the transformer nameplate is: ()
A, KV B, % C, V D, ohm
In the electrical management regulations, Class B electrical equipment The integrity rate should be maintained above ( ).
A, 100% B, 98% C, 97% D, 96%
Which of the following is not the three elements of sinusoidal alternating current ( )
A, voltage B, amplitude C, frequency D, initial phase angle
In the electrical management system regulations, The permission of the equipment outage notice is the responsibility of the equipment operating unit. It follows the principle of whoever operates it gets permission. However, for equipment with a power greater than or equal to ( ), the power transmission unit must notify the electrical on-duty personnel of the fifth operation department before sending power. . The CT transformation ratio of
A, 2500KW B, 2000KW C, 1500KW D, 2800KW
motor is 150/5, and the transformation ratio of the ammeter installed on site is 100/5, then the current value indicated by the ammeter is higher than the actual current value of the motor operation ( ) .
A Small B Uncertain C Large
The secondary coil of the current transformer is not allowed to be ( )
Ａ open circuit Ｂ short circuit Ｃ grounding
The rated secondary current of most 6KV current transformers in our factory is generally ( ) ampere during operation.
A, 5 B, 10 C, 15 D, 1
To measure the insulation resistance value of the secondary circuit, the megohmmeter selected should be ( ).
A 500V B 1000V C 2500V
For a 30kW motor, the input active power of the equipment it carries should generally be ( ).
A. Equal to 30kW (B) More than 30kW (C) Less than 30kW (D) Unsure
Power cables are generally not tested ( ).
A, DC withstand voltage B, AC withstand voltage C, measure insulation resistance D, check phase
When the motor is started directly, the starting current can generally reach ( ) times of the rated current.
A, 1~2 B, 5~7 C, 1 0~20 D, 20~30
The temperature rise of the motor is related to ().
Motor capacity B, motor rated voltage
C, insulation material used in the motor, rated current of the motor
Parameters that cannot be directly measured by a multimeter are ( )
A, 380V voltage B, 1000 ohm resistance
C, 6000V voltage D, 0.1 ampere current
Multiple-choice questions: (No points for multiple or small choices, 1 point for each question, 15 points in total)
Working on high-voltage equipment must comply with the following items: ( )
A Fill in the work ticket; B At least two people should be together work; C Complete the organizational and technical measures to ensure the safety of staff;
The safety responsibility of the issuer of the work ticket: ( )
A Whether the safety measures filled in on the work ticket are correct and complete;
B Whether the assigned work leader and work shift personnel are appropriate and whether the mental state is good enough.
C Whether the safety measures filled in on the work ticket are correct and complete;
D Whether the assigned work leader and work team members are appropriate and adequate and whether the mental state is good.
three-phase symmetrical load refers to ( ).
A: The impedance value of each phase is equal B: The impedance value difference of each phase C: The impedance phase angle difference of each phase is 120° D The impedance phase angle of each phase is equal E: The impedance phase angle difference of each phase is 180°
4, Our low-voltage comprehensive insurance manufacturer has ( )
A, ABB Company B: Siemens C: Schneider D: Shanghai Huajian
5, our factory’s voltage levels are ( )
A, 220KV B, 35KV C, 10KV D, 6KV E, 400V F 220V
6, our factory’s ordinary high voltage The protection types of the motor are ( )
A, quick-break protection B, overcurrent protection C, grounding protection D, light difference protection
7. The explosion-proof grades of our factory’s motors are ( )
A, EXdIICT4 B, EXeIIT3 C, EXdIICT2 D, EXdIIBT4
8, cable run The parts with the weakest insulation and the highest failure rate are: ( )
A, cable trench B, terminal connector C, corner D, intermediate connector
9. The nameplate data of the transformer all include ( )
A, rated capacity B, rated current C , Impedance voltage D, connection group
10, the starting methods of low-voltage motors in our factory are: ( )
A, direct start B, series impedance indirect start C, star-delta start D, variable frequency start
11, the main organizational measures to ensure safety in electrical work There are: ( )
A, work ticket system B, work permit system C, work supervision system D, work interruption, transfer and termination system
12. Fire extinguishing equipment to put out electrical fires are: ( )
A, 1211 fire extinguisher B, carbon dioxide fire extinguisher C, foam fire extinguisher D. Carbon tetrachloride fire extinguisher
13. The basic requirements for relay protection are ( )
A, quick action B, selectivity C, reliability D, sensitivity
14. Safety regulations stipulate that the following safety equipment inspection period is one year. : ( )
A, insulating boots B, insulating foot pads C, insulating partitions D, insulating gloves
15. In the electrical work ticket, those who can hold concurrent posts are: ( )
A, work ticket issuer B, work permit holder C, Duty person in charge D, work person in charge
